Ask HN: How Belarus can keep connected despite internet blackout?

Hello hackers. What would be your advice for Belarus protesters to keep connected to each other and the rest of the world.There are some solutions for short-range communication (e.g. https://briarproject.org/), but what are the solutions for the mid-range (e.g. city) and long-range (hundreds of kilometers) communication? I suppose the HAM radio could be used for that or AMPRNet. Any ideas how to provide low-cost, decentralized, communication infrastructure for the time when internet is cut off?